The growing demand for natural gas and oil, as energy sources, has driven industry’s need for ever-increasing strength levels in oil and gas transmission pipeline materials in order to achieve safe and economic transportation. The current world trend points to the use of pipes with larger diameters and thinner wall thicknesses, operating under high pressure. In addition, pipeline steels for sour service must exhibit good Hydrogen Induced Cracking (HIC) and Sulphide Stress Corrosion Cracking (SSCC) resistance. This study evaluates the susceptibility of API 5L-X80 girth welds to SSCC and Hydrogen Embrittlement (HE). Slow strain rate tensile (SSRT) tests and Hydrogen Permeation tests were performed at room temperature, in different acidic environment containing sodium thiosulfate solutions. Most of the SSRT tests undertaken in solution, showed a loss of ductility and a decrease in the reduction of area, as compared with tests conducted in air. The susceptibility to HE and potentially SSCC was evidenced by a reduction in ductility in the SSRT tests and an increase in the hydrogen permeation current values, for almost all welded joints. This was observed with greater intensity for the more acidic test solutions (pH = 3.4), while for the less acidic test solutions (pH = 4.4) little loss of ductility was observed and the hydrogen permeation current remained at values close to zero, indicating little or no permeation of hydrogen through the metal for the testing times applied. The behaviour exhibited by the samples tested in the more acidic solutions was attributed to the dissolution of material from the sample together with hydrogen embrittlement. These results confirmed that the use of sodium thiosulfate solutions to generate H2S, permits the study of phenomena related to SCC in environments containing sulphides.
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2010 8th International Pipeline Conference
September 27–October 1, 2010
Calgary, Alberta, Canada
Conference Sponsors:
- International Petroleum Technology Institute and the Pipeline Division
ISBN:
978-0-7918-4420-5
PROCEEDINGS PAPER
Study of the Susceptibility of API 5L X80 Girth Welds to Sulfide Stress Corrosion Cracking and Hydrogen Embrittlement Available to Purchase
Adriana Forero Ballesteros,
Adriana Forero Ballesteros
PUC-Rio, Rio de Janeiro, Brazil
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Jose´ A. da Cunha Ponciano,
Jose´ A. da Cunha Ponciano
PEMM-UFRJ, Rio de Janeiro, Brazil
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Ivani de S. Bott
Ivani de S. Bott
PUC-Rio, Rio de Janeiro, Brazil
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Adriana Forero Ballesteros
PUC-Rio, Rio de Janeiro, Brazil
Jose´ A. da Cunha Ponciano
PEMM-UFRJ, Rio de Janeiro, Brazil
Ivani de S. Bott
PUC-Rio, Rio de Janeiro, Brazil
Paper No:
IPC2010-31243, pp. 375-380; 6 pages
Published Online:
April 4, 2011
Citation
Forero Ballesteros, A, da Cunha Ponciano, JA, & Bott, IDS. "Study of the Susceptibility of API 5L X80 Girth Welds to Sulfide Stress Corrosion Cracking and Hydrogen Embrittlement." Proceedings of the 2010 8th International Pipeline Conference. 2010 8th International Pipeline Conference, Volume 1. Calgary, Alberta, Canada. September 27–October 1, 2010. pp. 375-380. ASME. https://doi.org/10.1115/IPC2010-31243
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